A high tolerance will increase the range of values and colors that are deleted, relative to the pixels you click on with the eraser. A low Tolerance will delete pixels only similar in color & value to the one you click on. The higher the number you type into the Tolerance box, the more pixels the Magic Eraser will eliminate. I'll talk about the rest of the settings later on, but the variable I'm concerned with here is the Tolerance. Well it wasn't exactly "Bam!" It took a little experimenting to find the right settings for the eraser to rid myself of the entire background. In the images at left, I found an image of a flower with a background that was pretty close in color & value, I clicked with the magic eraser as you see in the second and Bam! (Isn't there some cooking show that says that?)- in the third image my background is gone. (See the tutorial, Making Selections: Wielding the Magic Wand) The magic eraser works much like making a selection with the magic wand tool and hitting the clear key. Just get rid of one background, slap another one in there, and that's it. Getting rid of a background makes compositing images easy.
There's all the marquee tools, and the masking modes to name but a couple. Since there's no sign that photographers are going to stop putting these darn backgrounds in their images, Photoshop delivers with many ways to make selections. What's with backgrounds anyway? Photos just keep featuring them, then we, with the help of Photoshop, just keep eliminating them.
It's yet another option you have when your desire is to separate an object from it's background. The Magic Eraser Tool was new with Photoshop 5.5.
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